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Split `Command` struct into different structs for each command type (#1407) 

This reduces the space needed for each command.
This commit is contained in:
Guldoman 2023-03-04 21:23:09 +01:00 committed by George Sokianos
parent 2d2d715fd9
commit dbb9f30c81
1 changed files with 37 additions and 17 deletions
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54
src/rencache.c
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@ -28,21 +28,36 @@
#define CELL_SIZE 96
#define CMD_BUF_RESIZE_RATE 1.2
#define CMD_BUF_INIT_SIZE (1024 * 512)
#define COMMAND_BARE_SIZE offsetof(Command, text)
#define COMMAND_BARE_SIZE offsetof(Command, command)
enum { SET_CLIP, DRAW_TEXT, DRAW_RECT };
enum CommandType { SET_CLIP, DRAW_TEXT, DRAW_RECT };
typedef struct {
enum CommandType type;
uint32_t size;
/* Commands *must* always begin with a RenRect
** This is done to ensure alignment */
RenRect command[];
} Command;
typedef struct {
RenRect rect;
} SetClipCommand;
typedef struct {
int8_t type;
int8_t tab_size;
int32_t size;
RenRect rect;
RenColor color;
RenFont *fonts[FONT_FALLBACK_MAX];
float text_x;
size_t len;
int8_t tab_size;
char text[];
} Command;
} DrawTextCommand;
typedef struct {
RenRect rect;
RenColor color;
} DrawRectCommand;
static unsigned cells_buf1[CELLS_X * CELLS_Y];
static unsigned cells_buf2[CELLS_X * CELLS_Y];
@ -114,13 +129,14 @@ static bool expand_command_buffer() {
return true;
}
static Command* push_command(int type, int size) {
static void* push_command(enum CommandType type, int size) {
if (resize_issue) {
// Don't push new commands as we had problems resizing the command buffer.
// Let's wait for the next frame.
return NULL;
}
size_t alignment = alignof(max_align_t) - 1;
size += COMMAND_BARE_SIZE;
size = (size + alignment) & ~alignment;
int n = command_buf_idx + size;
while (n > command_buf_size) {
@ -136,7 +152,7 @@ static Command* push_command(int type, int size) {
memset(cmd, 0, size);
cmd->type = type;
cmd->size = size;
return cmd;
return cmd->command;
}
@ -156,7 +172,7 @@ void rencache_show_debug(bool enable) {
void rencache_set_clip_rect(RenRect rect) {
Command *cmd = push_command(SET_CLIP, COMMAND_BARE_SIZE);
SetClipCommand *cmd = push_command(SET_CLIP, sizeof(SetClipCommand));
if (cmd) {
cmd->rect = intersect_rects(rect, screen_rect);
last_clip_rect = cmd->rect;
@ -168,7 +184,7 @@ void rencache_draw_rect(RenRect rect, RenColor color) {
if (rect.width == 0 || rect.height == 0 || !rects_overlap(last_clip_rect, rect)) {
return;
}
Command *cmd = push_command(DRAW_RECT, COMMAND_BARE_SIZE);
DrawRectCommand *cmd = push_command(DRAW_RECT, sizeof(DrawRectCommand));
if (cmd) {
cmd->rect = rect;
cmd->color = color;
@ -181,7 +197,7 @@ float rencache_draw_text(RenWindow *window_renderer, RenFont **fonts, const char
RenRect rect = { x, y, (int)width, ren_font_group_get_height(fonts) };
if (rects_overlap(last_clip_rect, rect)) {
int sz = len + 1;
Command *cmd = push_command(DRAW_TEXT, COMMAND_BARE_SIZE + sz);
DrawTextCommand *cmd = push_command(DRAW_TEXT, sizeof(DrawTextCommand) + sz);
if (cmd) {
memcpy(cmd->text, text, sz);
cmd->color = color;
@ -249,8 +265,9 @@ void rencache_end_frame(RenWindow *window_renderer) {
Command *cmd = NULL;
RenRect cr = screen_rect;
while (next_command(&cmd)) {
if (cmd->type == SET_CLIP) { cr = cmd->rect; }
RenRect r = intersect_rects(cmd->rect, cr);
/* cmd->command[0] should always be the Command rect */
if (cmd->type == SET_CLIP) { cr = cmd->command[0]; }
RenRect r = intersect_rects(cmd->command[0], cr);
if (r.width == 0 || r.height == 0) { continue; }
unsigned h = HASH_INITIAL;
hash(&h, cmd, cmd->size);
@ -290,16 +307,19 @@ void rencache_end_frame(RenWindow *window_renderer) {
cmd = NULL;
while (next_command(&cmd)) {
SetClipCommand *ccmd = (SetClipCommand*)&cmd->command;
DrawRectCommand *rcmd = (DrawRectCommand*)&cmd->command;
DrawTextCommand *tcmd = (DrawTextCommand*)&cmd->command;
switch (cmd->type) {
case SET_CLIP:
ren_set_clip_rect(window_renderer, intersect_rects(cmd->rect, r));
ren_set_clip_rect(window_renderer, intersect_rects(ccmd->rect, r));
break;
case DRAW_RECT:
ren_draw_rect(window_renderer, cmd->rect, cmd->color);
ren_draw_rect(window_renderer, rcmd->rect, rcmd->color);
break;
case DRAW_TEXT:
ren_font_group_set_tab_size(cmd->fonts, cmd->tab_size);
ren_draw_text(window_renderer, cmd->fonts, cmd->text, cmd->len, cmd->text_x, cmd->rect.y, cmd->color);
ren_font_group_set_tab_size(tcmd->fonts, tcmd->tab_size);
ren_draw_text(window_renderer, tcmd->fonts, tcmd->text, tcmd->len, tcmd->text_x, tcmd->rect.y, tcmd->color);
break;
}
}